auth_{$object_type}_meta_{$meta_key}
Filter Hook: Filters whether the user is allowed to edit a specific meta key of a specific object type.
Source: wp-includes/capabilities.php:332
auth_{$object_type}_meta_{$meta_key}_for_{$object_subtype}
Filter Hook: Filters whether the user is allowed to edit a specific meta key of a specific object type and subtype.
Source: wp-includes/capabilities.php:311